const parseQueryString = function (url) {
    //url参数转对象
    url = !url ? window.location.href : url
    if (url.indexOf("?") === -1) {
        return {}
    }
    let search = url[0] === "?" ? url.substr(1) : url.substring(url.lastIndexOf("?") + 1)
    if (search === "") {
        return {}
    }
    search = search.split("&")
    let query = {}
    for (let i = 0; i < search.length; i++) {
        let pair = search[i].split("=")
        query[decodeURIComponent(pair[0])] = decodeURIComponent(pair[1] || "")
    }
    return query
}
